Swaging tool



swAqING TooL @www July 4, 1967 ci J. SCHWAB' TAL Filed Jul'y 22; 1964 July 4, 1961 c. J. SCHWAB TAL i r3,329,000

lSWAGING TOOL 2 Sheetsf-Sheet 2 Filed July 22, 1964 NWN NNN.

mwN www kw# United States Patent O 3,329,000 SWAGING TOOL Charles J. Schwab, Fox River Grove, and Edwin C.

Swanson, Rockford, Ill., assignors, by mesne assignments, to Huck Manufacturing Company, Detroit,

Mich., a corporation of Michigan Filed July 22, 1964, Ser. No. 384,406 17 Claims. (Cl. 72--391) This invention relates in general to a device for driving fasteners, and more particularly to a new and improved hydraulically actuated portable tool for swaging a tubular collar into intimate engagement with the locking grooves of a lock bolt.

This invention is particularly concerned with the lock bolt type of fastening means wherein the lock bolt is provided with an enlarged head, an elongated shank having a clearance portion adjacent said head, a plurality of locking grooves spaced outwardly of said clearance portion, a weakened portion outwardly of said locking grooves, and a plurality of pull grooves outwardly of said weakened portion. Lock bolts as described above are used by inserting the lock bolt through aligned holes in two members such as plates to be joined, with the clearance portion being received within the holes, and with the remainder of the shank extending outwardly therefrom. A tubular collar is placed over the locking groove portion, and is swaged into intimate engagement with the locking grooves to xedly secure the members together.

Some tools which have been conventionally used in the past to swage the tubular collar onto the locking grooves of the lock bolt have included means for engaging the pull grooves to pull the bolt, and an anvil which is forced axially into engagement with the collar to push the collar and force the plates to be joined toward each other and effect the swaging. Because ofthe relatively high forces necessary to effect the swaging, the anvil becomes rather securely xed to the collar during the swaging operation. Accordingly, after the swaging operation has been completed, it is necessary to provide means for positively removing the anvil from the collar. In the past it has been conventional to provide a fastener driving tool with a double acting piston and cylinder device operaable in one mode for gripping and pulling the pull grooves of the lock bolt, while at the same time forcing the anvil into swaging engagement with the collar, as when the piston is positively actuated in one direction. This piston movement is utilized to fracture the lock bolt at its weakened portion, and positive actuation of the piston in the opposite direction is utilized to release the anvil from engagement with the collar. Such known devices have not proven entirely satisfactory under all conditions partly because the double acting piston and cylinder device has made it necessary to provide complex hydraulic or pneumatic apparatus, such as porting for double acting equipment, appropriate tubing and other conduits, suitable pump apparatus as well as rather complicated valving means to control the piston actuating fluid. Further, the two cycle operation is time consuming. Additionally, some prior art devices have employed rather bulky and complex mechanisms for ejecting the so-called pintail which is separated from the bolt when the pull groove portion of the lock bolt parts under tension. The large number of parts involves expense in manufacture and requires too frequent maintenance and repairs. Also, prior tools have generally made use of a onepiece inexpansible anvil which had to be hardened to effectively swage and as a result often cracked under strain.

Accordingly, the general purpose of the present invention is to provide a new and improved tool for driving fasteners of the type described above, which obviates problems encountered in known devices. To effect this,

3,329,000 Patented July 4, 196.7

the applicant has provided a tool which is -light in weight, compact in size, simple in construction, etiicient in operation, and relatively inexpensive to manufacture and maintain.

An object of the invention is to provide a tool for swaging a tubular collar on the grooved portion of a headed pin in a minimum amount of time.

A related object is to provide a tool as described in the preceding paragraph with a single acting piston and cylinder device which minimizes the swaging cycle time and simplifies construction.

Another object of the invention is to provide a tool as `described above with novel means for releasing the anvil from engagement with the tubular collar.

A further object of the invention is the provision of new and improved anvil means for use in a tool of the type described above. In the preferred form, a work engaging anvil portion is made separately from an anvil holder and thus may be separately hardened to swage while reinforced'by the more ductile holder to prevent cracking. Also, the anvil is expansible to readily release the work.

These and other objects of the invention will hereinafter become more fully apparent from the following description taken in connection with the accompanying drawings wherein:

FIG. l is a sectional view illustrating a fastener to a reduced scale in position in a pair of plates to be joined prior to the application of the driving tool;

FIG. 2 is a view similar to FIG. l, after the application of the driving tool and completion of the fastening operation; p

FIG. 3 is a side elevational View, partially in central section. showing a rst embodiment of the invention;

FIG. 4 is an enlarged fragmentary view of the forward end of the tool as illustrated in FIG. 3;

FIG. 5 is a fragmentary top plan view of the tool illustrated in FIG. 3;

FIG. 6 is a fragmentary front elevation view of the tool illustrated in FIG. 3;

FIG. 7 is a' fragmentary rear elevational view of the tool illustrated in FIG. 3;

FIG. 8 is a fragmentary central sectional view of a second embodiment of the invention; and

FIG. 9 is a front end view of the embodiment illustrated in FIG. 8.

.While this invention is susceptible of embodiment in many different forms, there is shown in the drawings and will herein be described in detail only two specic embodiments, with the understanding that the present disclosure is to be considered as an exemplication of the principles of the invention and is not intended to limit the invention to the embodiments illustrated. The scope of the invention will be pointed out in the appended claims.

Referring now tothe drawings, wherein like reference characters designate like or corresponding parts throughout the several views, a fastener 10 is shown extending through a pair of aperture plates 11 and 12. The fastener4 10 includes an enlarged head 13 abutting against the outer surface of plate 11, and an elongate shank including a clearance portion 14 received within the openings in the plates 11 and 12, a portion 15 having a plurality of locking grooves outwardly of clearance portion 14, a weakened portion of reduced diameter 16 outwardly of grooved portion 15, and an outermost portion 17 having a plurality of pull grooves. As can be best seen in FIG. l,

the plates 11 and 12 may be initially spaced, and the tubular collar 18 is loosely received around the locking groove portion 15. After the application of the driving tool to be hereafter described, the plates 11 and 12 have been pulled into abutting relationship, as shown in FIG.

a 2, the collar 18 has been swaged into intimate engagement with the grooves on portion 15, as shown 18', and the pintail section 17 has been fractured at weakened portion 16 and removed.

The tool for driving the fastener shown in FIGS. l and 2, is illustrated generally at 20 in FIG. 3. Tool 20 includes a handle made of two mating mirror halves 21 held together as at 21a and which provides an enlarged generally annular upper end 19. An end cap 22 is secured to handle portion 19 by a plurality of screws 24 (FIG. 7). A generally cylindrically shaped body 23 is fixed to the end cap 22 by a plurality of screws 35 (FIGS. 3 and 7). Body 23 is provided with a central bore 25, which defines the cylinder of a piston and cylinder device to be hereinafter more fully described in detail. As can be clearly seen in FIG. 3, the rearward end of bore 25 is seated on a pilot boss 26 extending outwardly from the forward face of end cap 22. Screws 35 hold the rearward end 27 of the body 23 in ush abutting relationship with the forward face 28 of the end cap 22.

End cap 22 is provided with a bore 30, which is substantially concentric with the bore 25. A cup shaped spring retainer 31 is seated within bore 30, and is provided with a central aperture 32. A hollow guard or pintail ejection member 33 of hard rubber or the like extends rearwardly through a central opening 34 in the end cap 22, and includes an enlarged forward ange 39 seated within bore 30 adjacent spring retainer 31. Member 33 is provided with a closed rear end 36, to prevent rearward ejection of the pintails, as will hereinafter become more fully apparent. At least one lateral opening 37 is provided in one side of the ejection member 33, through which the pintails may be ejected.

Bore 25 is provided with a forward portion of reduced diameter 38 which opens outwardly from the body 23 A piston 40 is slidably mounted within cylinder 25, and includes a peripheral groove 41 in which a sealing ring 42 is seated. Piston 40 includes a central bore 43, and a forwardly extending portion 44 of reduced diameter, which is slidably received in bore portion 38, and which extends outwardly from the front end of body 23. Piston bore 43 has an intermediate portion 45 of reduced diameter, and an annular spring seat 46 is abutted against the shoulder at the juncture on the different bores. A spring 47 extends between seat 46 and retainer 31 to urge the piston 40 to the left as viewed in FIG. 3 outwardly of body 23. Means to be hereafter described are provided for shifting piston 40 to the right in cylinder 25 against the bias of spring 47 to effect the pulling of the fastener and the swaging of the collar 18.

A recess 50 is provided in the forward end of body 23, and an enlarged flange 51 of a tubular anvil holder 52 is seated therein. A snap ring 53 is seated Within a suitable groove in the body 23 and bears against the forward face of flange 51 to retain the anvil holder 52 within the recess 50. Anvil holder 52 is generally cylindrical in shape with flattened sides 52a (FIG. 6), and includes a central bore 54 (FIG. 4) which is generally concentric with cylinder portion 38, and which slidably receives piston portion 44 therein. The forward end of bore 54 is provided with a portion 55 of reduced diameter which defines a cylindrical wall 56 concentric with bore 54. A frusto-conical wall 57 diverges outwardly from Wall 56, and provides an open end in the anvil holder 52.

As illustrated, a pair of substantially identical anvil members 58 form an annular anvil and are held in the open forward end of holder 52 as by the engagement of a snap ring 60 in a peripheral groove 61 in the anvil members. As can be best seen in FIG. 4, groove 61 is axially slightly longer than the thickness of the ring 60 so that the anvil members 58 are free to move longitudinally with respect to the holder 52 a slight amount. Each anvil member 58 includes a generally semi-cylindrical 75 rearward end 62 which includes the groove 61. Anvil members 58 further include an outwardly extending generally frusto-conical portion 63, which is shaped generally complementarily with the frusto-conical wall 57 in the holder 52. Thus, when holder 52 moves to the right with respect to the anvil members 58, the anvil members 58 are free to expand radially outwardly with respect to the holder 52. The relative movement between the anvil members 58 and the holder 52 is limited by the length of groove 61, and as will hereinafter become more fully apparent, groove 61 is large enough to allow anvil members 58 to move a suicient amount to clear the collar 18 after swaging.

While two anvil members 58 have been shown in the illustrated embodiment, it should be understood that a larger number may be used, if desired. It should also be understood, that for the purposes of the present invention, it is not necessary that the two anvil members be separate parts, as will appear. In this respect, a single member having a plurality of longitudinal slots therethrough for part of the anvil length may in effect dene a plurality of anvil fingers that would function satisfactorily for the purposes of the present invention. The anvil members 58 of the embodiment shown in FIGS. 3-7 are preferably formed from a single member or blank which is provided with a pair of diamet-rically opposed longitudinal slots 64 (FIGS. 4 and 6) to facilitate handling during manufacture. The two anvil members 58 may be formed by sawing through the blank as at 65 (FIGS. 4 and 6). The anvil blank is preferably hardened prior to the severing and it will be understood that the anvil members 58 are extremely hard -to effect the desired swaging action upon engagement of conical inner anvil surface 58a with the outer surface of collar 18. For example, it has been found that anvil members which are hardened in the range of 54-58 on the Rockwell C scale have been ideally suited for the purposes of the present invention.

Anvil holder 52 is preferably somewhat softer, more elastic and tougher than the relatively harder, more brittle and less resilient anvil members, so that the holder reinforces the anvil against breakage. In one embodiment, for example, the anvil is made of SAE 6150 steel heat treated to a hardness in the range of 54-58 on the Rockwell C scale, and the holder is made of SAE 4340 steel heat treated to a hardness of 40-43 on the Rockwell C scale. The anvil holder surface 57 is preferably surface hardened to provide a wear resistant surface for engaging the anvil.

The means for grasping the pull groove portion 17 of the fastener 10 will be lbest understood from a consideration of FIG. 3. Piston bore 43 is provided with a second portion 70 of reduced diameter spaced forwardly from portion 45. An inclined, generally frusto-conical wall 71 extends rearwardly from portion 70, and a plurality of chuck jaws 72 are seated thereagainst. The outer forward portion 73 of each of the chuck jaws is conically shaped complementary to the wall 71, and each of the chuck jaws includes an internally grooved portion 74 that is adapted to grip the grooved portion 17 of the fastener 10. Thus, when the tool 20 is placed in position, with the lock bolt grooved portion 17 being disposed within the jaws 72, and the piston 40 is moved to the right by means to be hereinafter described, inclined surface 71 will force the jaws 72 inwardly into gripping engagement with the grooved portion 17. A cup shaped sleeve 77, having an aperture 75 in the base thereof, abuts against the rearward ends of jaws 72 and a spring 76 is biased between the annular base of the sleeve 77 and the ring 46 to urge the sleeve 77 to the left. This tends to hold the jaws 72 against a sleeve 81 to prevent free movement and accidental collapse, so that they will readily receive the grooved portion 17 of the fastener 10 when the gun is properly in position.

As can 4be best seen in FIGS. 3 and 4, piston bore 43 is provided with a third portion 80 of reduced diameter at the forward end thereof. Tubular sleeve 81 is slidably mounted in bore portion 80, and includes an enlarged flange 82 at the rearward end thereof which is slidably received within bore portion 70. A snap ring 83 is received within a peripheral groove in sleeve 81, and is adapted to engage the forward end of piston 40 to lock sleeve 81 for movement with piston 40 when it moves to the left. The forward end of sleeve 81 is engageable with the -rearward end of the anvil members `58, so that when the piston 40 moves to the left relative to the anvil holder 52, the sleeve 81 will assist in opening the anvil members 58 from Igripping engagement with the swaged collar 18 to the expanded position shown.

The means for effecting the desired movement of piston 40 will be best understood from Va consideration of FIG. 3. The handle 21 is provided with a trigger 90, which is adapted to close a switch shown generally at 91 when the trigger is squeezed, to complete a circuit through an electrical cord 91a to a pump system, not shown, including a motor and a pump driven thereby and adapted to force fluid under pressure through hydraulic line 92 into the cylinder 25 to force the -piston 40 to the right against the bias of spring 47. To this end, a suitable fitting 93 is provided at one end of the hydraulic line 92 for connection with the pump output, and another fitting 94 is provided at the other end of the hydraulic line 92 for connection in a chamber 95 in the end plate 22. A passage 96 extends outwardly from chamber 95, and cornmunicates with an axially extending passage 97 in the body 23. An O-ring 98 surrounds passage 97 to provide a uid tight connection between passages 96 and 97. An inclined passage 99 extends from passage 97 into the cylinder 25, and is adapted to supply fluid under pressure to the left side of piston 40 to force the same to the right against the bias of spring 47. It will be understood, that when trigger 90 is released to break the circuit to the motor, the spring 47 will force piston 40 to the left to force the fluid out of cylinder 25. An O-ring 100 is provided in an annular recess in the body 23 to cooperate with the O-ring 42 in the piston 40 to provide a fluid tight cylinder construction. While hydraulic piston actuating apparatus has been illustrated, it should be understood that pneumatic apparatus may be used for the purposes of the present invention.

In operation, the fastener is positioned as shown in FIG. 1 with the collar 18 being loosely received on the locking groove portion 15. The tool 20 is then placed in position with the pull groove portion 17 being received within the chuck jaws 72, and `the anvil members 58 abutting against the rearward end of the collar 18. Trigger 90 is then depressed to make the circuit to the electric motor and cause the pump to supply fluid under pressure to the left side of piston 40. Movement of the piston 40 to the right causes the jaws 72 to close .into gripping engagement with the grooved fastener portion 17 and exert an axial pull thereon to move plates 11 and 12 into abutting engagement. The force to move piston 40 to the right will react upon the body 23 to force it to the left, and the anvil members 58 will be forced into swaging engagement with the sleeve 18 to deform it radially and axially into the shape shown at 1-8 in FIG. 2. After the collar has been swaged, a's the piston 40 approaches the end of its travel to the right, the pull of the chuck jaws 72 on the pull groove portion 17 will cause the lock bolt to be fractured at the weakened portion 16. As is clear from FIG. 3, an unobstructed axial passage is provided in the too'l, so that the pintail may be ejected by merely inverting and canting the tool after the fastener driving operation is completed and the pintail will fall through the tool and out of the ejector 33 through aperture 37.

Because of the split anvil design, as the swaging force is being applied, the anvil members 58 will be forced together and moved slightly axially inwardly of holder 52. When trigger 90 is released, and piston 40 moves to the left under the urging of spring 47, the reaction force on the body 23 will tend to pull the anvil holder 52 to they right. The forward end of sleeve 81 will engage the rearward end of the anvil members 58 to force them axially and radially outwardly of holder 52 by the action of springs 47 and 76 upon sleeve 77, jaws 72, and sleeve 81; to release the anvil members 58 from engagement with the swaged collar 18. Also, it will be Iunderstood that although the anvil is tight on the collar 18 after the swaging, upon release of trigger and loss of fluid pressure, a manual pull of the tool axially of the bolt will move the anvil axially outwardly of the holder, allowing radial expansion and release.

Turning now to the embodiment illustrated in FIGS. 8 and 9, it will be noted that certain parts therein are substantially the same as, or identical with corresponding parts in the embodiment of FIGS. 3-7, and accordingly similar reference numerals have been used, with the sum having been added to the reference numerals used in connection with the elements of the embodiment shown in FIGS. 8 and 9. The embodiment of FIGS. 8 and 9 is even more compact and simple in construction than the embodiment of FIGS. 3-7. In -this respect note that the piston portion 144 is substantially shorter than piston portion 44 and that the reaction sleeve 81 has been eliminated or made integral with anvil 158 in the embodiment of FIGS. 8 and 9. The chuck jaws 172 react directly against the rearward end of anvil member 158 to release the anvil member from swaging engagement with the collar 18 as the piston 140 moves to the left.

The anvil 158 in the embodiment of FIGS. 8 and 9 is a single member having a -generally cylindrical rearward end 1-62 provided with a peripheral groove 161 in which a retention ring 160 is mounted. Groove 161 is slightly wider than the thickness of ring 160 so' that the anvil 158 is free to move longitudinally relative to the holder 152. Anvil 158 includes an outwardly diverging, generally frusto-conical portion 163 which is shaped complementarily to the inclined wall 157 provided at the end of the holder 152. Anvil 158 is provided with a pair of diametrica'lly opposed, longitudinally extending slots 164, and a crut 165 lis made through one of the slots 164 to dene a split anvil construction. Thus, when piston 140 is moved to the right, and the anvil holder 152 is moved to the left, the anvil 158 will move into swaging engagement with the collar 18. The frusto-conical piston portion 171 will engage the frust-o-conical portion 173 of chuck jaws 172 to force them inwardly into clamping engagement with the lock bolt pull groove portion 17. Continued movement of the piston 140 to the right will fracture lock bolt 10 at the Iweakened portion 16, and the pintail may be ejected in the manner described above. Anvil 158 is free to cornpress generally radially inwardly of holder 152 as the swaging takes `place due to the slotted construction 164- 165. As can be seen in FIG. 8, the rearward end of the anvil 158 abuts against the forward end of the lchuck jaws 172, so that as the piston 140 is moved to the left and holder 152 moves to the right, the anvil 158 will be released from engagement with the swaged collar 18 by the action of spring 176 upon sleeve 177 and chuck jaws 172. In all respects not described, the tool of FIGS. 8 and 9 is similar to that previously described.

Thus, it will be seen that we have provided a tool which obviates the disadvantages and attains the objects set forth at the beginning of the specification. The pintail is simply ejected through the rear of the tool without need for positive ejection means. The hardened anvil effectively swages and withstands wear, while the more elastic holder reinforces the anvil to prevent breakage of the latter, though the surface of the holder engaging the anvil may be hardened to resist wear. The single acting piston and cylinder with spring return and releasable anvil significantly reduces the complexity and weight of the tool as well as that of the periphery apparatus required for use with the gun.

We claim:

1. A hydraulic tool operable from a source of hydraulic fluid under pressure for swaging a tubular collar onto a fastener comprising: a body having a cylindrical bore; a piston movable in said bore; fluid means communicating with one end of said bore and with the source for providing fluid under pressure to move said piston in one direction in said bore; spring means including a spring for moving said piston in an opposite direction in said bore and for returning the fluid to the source solely by the force of said spring; a holder on said body and carrying anvil means for swaging said collar; means responsive to movement of said piston in said one direction for moving said anvil means in a direction toward said collar into swaging engagement therewith.

2. A hydraulic tool operable from a source of hydraulic fluid under pressure for swaging a tubular collar onto a fastener comprising: a body having a cylindrical bore; a piston movable in said bore; fluid means communicating with one end of said bore and with the source for providing uid under pressure to move said piston in one direction in said bore; spring means including a spring for moving said piston in an opposite direction in said bore and for returning the fluid to the source solely by the force of said spring; a holder on said body and having an opening adapted to receive said collar; anvil means in said opening for swaging said collar; connecting means mounting said anvil means in said opening for movement longitudinally and radially of said holder; said anvil means operative with said connecting means and responsive t-o movement of said piston in said one direction for moving into swaging engagement with said collar and for moving longitudinally and radially outwardly of said holder for releasing from swaging engagement with said collar.

3. A tool as defined in claim 2 wherein said opening is defined `by a generally frusto-conical wall, and wherein said anvil means includes a frusto-conical portion complementarily coacting with said wall.

4. A tool as defined in claim 2 in which said anvil means is provided with a peripheral slot, and wherein a retention member having a thickness less than the width of said slot is received in said slot.

5. A tool as defined in claim 2 wherein said anvil means is defined by a single member having a longitudinal slot therein.

6. A tool as defined in claim 2 wherein said anvil means is defined by a plurality of separate anvil segments.

7. In a portable swaging tool, an elongate, generally cylindrical anvil holder having a front and a rear end; an axial passage in said holder and extending from end to end thereof; a portion of reduced diameter in said passage defined by a cylindrical wall adjacent the front end of said holder and spaced inwardly therefrom, said portion of reduced diameter providing a shoulder at the rear end of said cylindrical wall disposed at substantially right angles to the axis of said holder; said passage including a frusto-conical wall extending outwardly from the front end of said cylindrical wall and opening outwardly from the front end of said holder; an expandable, annular anvil in said passage at the front end of said holder and including, a generally cylindrical rear portion adjacent said cylindrical wall, a frusto-conical forward portion adjacent said frusto-conical wall, and a peripheral groove in said cylindrical portion; and a retaining ring in said groove and positioned for engagement with said shoulder, said ring having a thickness less than the axial length of said groove whereby said anvil is mounted for limited movement axially of said holder.

8. A tool as defined in claim 7 wherein said anvil is formed of two generally identical semi-annular members.

9. A tool as defined in claim 7 wherein said anvil is formed of a single annular member having a longitudinal slot extending from end to end thereof.

10. A tool as defined in claim 7 wherein said anvil is formed of a material substantially harder than said holder.

11. A tool as defined in claim 10 wherein the hardness of said anvil is in the range of 54 to 58 on the Rockwell C hardness scale.

12. In a portable pistol shaped swaging tool for swaging a tubular collar on an intermediate portion of a lock bolt having an end portion adjacent said intermediate portion: a tool body including a hand grip portion having a fluid control trigger, and a barrel portion having a cylindrical bore opening outwardly of the rear end of said tool; a hollow piston movably mounted in said bore, and having an elongated forward end extending outwardly from the forward end of said barrel; annular spring means urging said piston outwardly of said bore; fluid conduit means communicating with said bore for supplying uid under pressure to move said piston inwardly of said barrel against the bias of said spring; an elongate, generally cylindrical anvil holder having a front and a rear end; means `mounting said holder on said body in concentric relationship with respect to said piston forward end; an axial passage in said holder and extending from end to end thereof; a portion of reduced diameter in said passage defined by a cylindrical wall adjacent the front end of said holder and spaced inwardly therefrom, said portion of reduced diameter providing a shoulder at the rear end of said cylindrical wall disposed at substantially right angles to the axis of said holder; said passage including a frusto-conical wall extending outwardly from the front end of said cylindrical wall and opening outwardly from the front end of said holder; an expandable, annular anvil in said passage at the front end of said holder and including a generally cylindrical rear portion adjacent said cylindrical wall, a frusto-conical forward portion adjacent said frusto-conical wall, and a peripheral groove in said cylindrical portion; a retaining ring in said groove and positioned for engagement with said shoulder, said ring having a thickness less than the axial length of said groove whereby said anvil is `mounted for limited movement axially of said holder; and chuck means movably mounted in said piston forward end and adapted to engage said lock bolt end portion upon movement of said piston inwardly in said barrel to exert an axial pull on said lock bolt and remove the end portion therefrom.

13. In a swaging tool for swaging a tubular collar on an intermediate portion of a lock bolt having an end portion adjacent said intermediate portion; a tool body having a cylindrical bore; a piston movably mounted in said bore, and having an elongated forward end extending outwardly from the forward end of said body; spring means urging said piston outwardly of said bore; uid conduit means communicating with said bore for supplying uid to move said piston inwardly of said barrel against the bias of said spring; an elongate, generally cylindrical anvil holder having a front end and a rear end; means mounting said holder on said body in concentric relationship with respect to said piston forward end; an axial passage in said holder and extending from end to end thereof; a portion of reduced diameter in said passage defined by a cylindrical wall adjacent the front end of said holder and spaced inwardly therefrom, said portion of reduced diameter providing a shoulder at the rear end of said cylindrical wall disposed at substantially right angles to the axis of said holder; said passage including a frusto-conical wall extending outwardly from the front end of said cylindrical wall and opening outwardly from the front end of said holder; an expandable, annular anvil in said passage at the front end of said holder and including, a generally cylindrical rear portion adjacent said cylindrical wall, a frustoconical forward portion adjacent said frusto-conical wall, and a peripheral groove in said cylindrical portion; a retaining ring in said groove and positioned for engagement with said shoulder, said ring having a thickness less than the axial length of said groove whereby said anvil is mounted for limited movement axially of said holder; chuck means movably mounted in said piston forward end and adapted to engage said lock bolt end portion upon movement of said piston inwardly in said barrel to exert lan axial pull on said lock bolt and remove the end portion therefrom; movement of said piston inwardly in said barrel reacting upon said body to force said anvil in a swaging direction int-o engagement with said collar to deform the same radially and axially into engagement with said lock bolt intermediate portion whereby said anvil is moved axially and radially inwardly; movement of said piston outwardly in said barrel moving -said anvil axially and radially outwardly to release the anvil from engagement With said collar; and means dening an axial passage through said tool for ejecting said lock bolt end portion.

14. Apparatus operable from a source of hydraulic pressure for setting a fastener of the type including a pin having a shank and a tubular collar adapted to be located upon land swaged onto the shank of the pin, said apparatus comprising: body means for defining a cylinder; piston means supported on said body means for reciprocable movement within said cylinder; gripping means operatively connected With said piston means for gripping the end of the shank of the pin responsively to movement of said piston means in one direction in said cylinder; anvil means supported on said body means and movable between lirst and second positions to define a rst central opening in said rst position and a second expanded central opening in said second position; said anvil means being engageable with the collar and movable to said Llirst position `for swaging the collar onto the shank of the pin responsively to movement of said piston means in said one direction, and being movable to said second position and disengageable from the swaged collar; iluid passage means in communication with one end of said cylin- 10 der for permitting fluid flow to and from said one end of said cylinder; hydraulic pressure means selectively actuable for flowing fluid under pressure from the source of hydraulic pressure through said fluid passage means and into said cylinder for moving said piston means in said one direction; and spring means operatively connected to said body means and said piston means and normally urging said piston means in said opposite direction for moving said piston means in said opposite direction upon deactuation of said hydraulic pressure means and for returning the lluid in said cylinder to the source of hydraulic pressure through said fluid passage means.

15. tAppar-atus as defined in claim 14 wherein said anvil means is generally annular and comprises a plurality of separate anvil members.

16. Apparatus as dened in claim 14 wherein said anvil means comprises a generally annular ring having a longitudinal split therein.

17. Apparatus as defined in claim 14 wherein said anvil means is mounted for axial movement on said body means between said Ifirst and second positions.

References Cited UNITED STATES PATENTS 2,088,859 8/1937 Huck 72-391 X 3,143,903 y8/1964 Van Hecke 72-391 3,196,662 7/1965 Simmons 72-391 WILLIAM W. DYER, IR., Primary Examiner. ANDREW R. JUHASZ, Examiner. 

1. A HYDRAULIC TOOL OPERABLE FROM A SOURCE OF HYDRAULIC FLUID UNDER PRESSURE FOR SWAGING A TUBULAR COLLAR ONTO A FASTENER COMPRISING: A BODY HAVING A CYLINDRICAL BORE; A PISTON MOVABLE IN SAID BORE FLUID MEANS COMMUNICATING WITH ONE END OF SAID BORE AND WITH THE SOURCE FOR PROVIDING FLUID UNDER PRESSURE TO MOVE SAID PISTON IN ON DIRECTION IN SAID BORE; SPRING MEANS INCLUDING A SPRING FOR MOVING SAID PISTON IN AN OPPOSITE DIRECTION IN SAID BORE AND FOR RETURNING THE FLUID TO THE SOURCE SOLELY BY THE FORCE OF SAID SPRING; A HOLDER ON SAID BODY AND CARRYING ANVIL MEANS FOR SWAGING SAID COLLAR; MEANS RESPONSIVE TO MOVEMENT OF SAID PISTON IN SAID ONE DIRECTION FOR MOVING SAID ANVIL MEANS IN A DIRECTION TOWARD SAID COLLAR INTO SWAGING ENGAGEMENT THEREWITH. 